More than 1.2 gigawatts of new solar capacity were connected to UK homes and businesses in 2024, a record that beats the previous high from 2015 by nearly a third. That is roughly the output of a nuclear reactor, spread across hundreds of thousands of rooftops.
The surge is not a surprise to anyone watching energy bills. As reported by Open Access Government, the UK is now adding solar capacity faster than at any point in the last decade. But what does that mean for the homeowner who has been sitting on the fence?
Who qualifies, and who doesn’t
Almost any home with a south-facing, east-west, or flat roof can host panels. The rule of thumb: you need at least 15 m² of unshaded roof space for a 4 kW system, the size that covers a typical 3-bed semi’s daytime electricity use. If you have a north-facing roof or heavy tree cover, a ground-mounted array in the garden might still work, though planning permission is required.
Renters and flat owners face a harder path. Landlords must consent to roof alterations, and leases often restrict external changes. The government’s 0% VAT on solar installations (extended to March 2027) applies to all installations, but the upfront cost, typically £5,000–£7,000 for a 4 kW system, still deters many. The Energy Saving Trust estimates that a third of UK homes are unsuitable for rooftop solar, mainly due to orientation or shading.
What it costs a typical 3-bed semi
A 4 kW system with 10–12 panels costs roughly £5,000–£7,000 installed, including the inverter and scaffolding. The 0% VAT saves about £1,000–£2,000 compared to the old 20% rate. Annual savings depend on how much daytime electricity you use: a household that is home during the day and runs appliances when the sun shines can save £1,100 a year. A typical commuter household, using most power in the evening, saves closer to £500.
The Smart Export Guarantee (SEG) pays 5–15p per kWh for surplus electricity fed back to the grid. A 4 kW system exporting half its output could earn £100–£250 a year. Ofgem data shows the average SEG rate is currently 6.5p/kWh, though some suppliers offer fixed tariffs for three years.
EPC impact and resale value
Solar panels can lift an EPC rating by up to 15 points, enough to move a D-rated home to a C. That matters because from 2025, landlords cannot let properties below EPC C, and homeowners with a C or above qualify for lower mortgage rates on green home products. The Royal Institution of Chartered Surveyors suggests solar panels add 2–5% to a property’s value, though the effect varies by region and buyer appetite.
But here is the catch: panels alone are rarely enough. An EPC assessor also considers insulation, glazing, and heating. A home with single glazing and no loft insulation will not hit C even with 4 kW of panels. The government’s Great British Insulation Scheme and the Boiler Upgrade Scheme offer grants for the other upgrades that make solar viable.
Grants and timelines
The 0% VAT on solar panels runs until 31 March 2027. After that, the rate reverts to 20%. The Smart Export Guarantee is open-ended, but rates are set by suppliers and can change. Homeowners on standard variable tariffs can apply for the Energy Company Obligation (ECO4) scheme, which may cover part of the cost for low-income households.
Installation takes one to two days, and most systems pay back their cost in 7–12 years. With panels lasting 25–30 years and inverters needing replacement at year 12 (costing £800–£1,200), the net gain over the system’s life is typically £5,000–£15,000 for a 4 kW array.
Households considering solar should check their roof orientation on the Energy Saving Trust’s solar calculator, then compare quotes from at least three MCS-certified installers. Applications for the 0% VAT rate must be made through the installer, not the homeowner. The window is open now, but it closes in March 2027.
Frequently Asked Questions
No, rooftop solar panels are permitted development in England, Wales, and Scotland as long as they do not protrude more than 200mm from the roof plane. Homes in conservation areas or listed buildings need planning permission. Ground-mounted arrays require planning if they exceed 9 m² or are in a designated area.
Solar panels still generate electricity on cloudy days, typically 10–25% of their rated capacity. A battery storage system (costing £2,000–£6,000) can store daytime surplus for evening use, but the payback period is 10–15 years. Most households rely on grid electricity at night and export surplus during the day under the Smart Export Guarantee.
